Scraping tool



Patented Apr. l, 1952 UNITED STA'EES PTN soaAPING fromJ Application September 29, 194g, S erial No. 118,679

(Cl. Sii-i172) l Claim. l

This invention relates to a scraping tool, and the invention has reference, more particularly, to an improved construction of oscillating blade `type of tool of the general character disclosed in Wallace Patent No. 2,233,657.

The present invention has for an object to provide a scraping tool of the oscillating blade Jtype wherein a plurality or group of spaced blades are supported in a holding body or block subject to oscillation or swing, whereby the opposite cutting edges of the blades are alternately brought into operation by the back and forth motion imparted to the tool in use.

In the improved tool according to the present invention, the group of scraping blades comprises terminal blades disposed to extend transversely ofthe holding body or block, respectively at the opposite ends thereof, and at right angles 'or perpendicular to the longitudinal axis of -said body or block, and a plurality of intermediate blades set transversely diagonal or oblique to the longitudinal axis of the body or block. In the improved tool thus characterized, the terminal Iblades serve ras tracker blades which operate in use to prevent divergence of the tool from a substantially straight forward and back movement, so that the oblique blades, in traversing the straight forward and back path of movement of the tool, will so present their cutting edges, relative to the surface to be scraped thereby, as to effect a diagonal cut, thus producing a highly efficient scraping action with attendant reduction of resistance to tool movement, so that less exertion or force is required for operation of the t'ool, and less fatigue is experienced by the operator.

An illustrative embodiment of this invention is :shown in the accompanying drawings, in which:

Fig. 1 is a side elevational view of the scraping tool; Fig. 2 is a bottom plan view thereof; Fig. 3 is a transverse vertical sectional view of the same; and Fig. 4 is a fragmentary longitudinal sectional View thereof.

Similar characters of reference are employed Ain the above described views, to indicate ycorresponding parts.

Referring to the drawings, the tool comprises a generally rectangular body or block I of suit# able length, width and thickness. The body or block I0 is preferably made of resilient material, such as soft rubber or like somewhat elastically compressible material. Adjacent to each end thereof, the body or block I0 is provided with a transverse terminal groove or socket I I, the longitudinal axis of which extends perpendicularly or rig-ht angularly to the longitudinal axis of the body or block, and which indents the bottom of said body or block. Formed in the body or block, intermediate said terminal grooves or sockets II, so as to 'be spaced from the latter and parallelly spaced one from another, is a group of transverse intermediate grooves or sockets I2, the longitudinal axes of which extend diagonally or oblique to the longitudinal axis of the body or block, and which also indent the bottom of said body or block. Both said terminal grooves orvsockets II and said intermediate grooves or sockets I2 are of inverted V-shape or triangular in crosssection, thus widening at their mouths, which lie in the plane of the bottom face of the body or block I0, with their `sides converging upon blade fulcruming seats I3 within the interior of the body or block.

Within the respective terminal grooves or sockets II are mounted scraper blades I5 which, for the purpose of distinguishing the same from other blades of the tool, are hereinafter sometimes referred to as tracker blades. Within the respective oblique intermediate grooves or sockets I2 are mounted like scraper blades I5 which, for the purpose of distinguishing the same from said tracker blades, are hereinafter sometimes referred to -as oblique cut blades. Both the tracker and the oblique cut blades Ivi and I5 are of rectangular shape, and of width substantially in excess of the depths of the grooves or sockets ,II and I2, so that operative longitudinal portions thereof freely project well beyond the bottom face plane of the body or block I0. The blades I4 and I5 are preferably of lengths corresponding substantially to the lengths of the grooves or `sockets in which they are mounted. The upper longitudinal edges of the blades I4 and Ifengage the seats i3 of the grooves or sockets in which they are mounted, so that said blades are fulcrumed on said seats for back and forth oscillation or swing between the sides of said grooves or sockets. The lower longitudinal edges of `the blades I4 and I5 are suitably sharpened Ato provide oppositely presented cutting edges I6 and I1. i

Each of the blades I4 and I5 is provided, in that part thereof which is housed in a groove or socket, and midway between the blade ends, with a perforation or slot I8. Extending longitudinally through the body or block Ii), in a plane which intersects the grooves or sockets II and I2 thereof, is a keeper rod I9 which passes through the performations or slots I8 of each blade, thereby securing said blades against disblade for the scraping operation. The blades I4 and I5 may be easily removed from the body or block I0, for resharpening, reversal or replacement, by withdrawing the keeper rod I9 from the body or block.

In operation of the scraping tool in use, the operator will apply the dependent free edges of the blades to the surface to be scraped, and will then reciprocate the tool in the direction of its longitudinal axis. On forward movement of the tool, the blades will swing back against the rear sides of the grooves or sockets in which they are housed, thus applying the forward cutting edges I6 of said blades to the surface to be scraped thereby (see Fig, 1). On reversed or rearward movement of 'the tool, the blades will swing forward against the forward sides of the grooves or sockets in which they are housed, thus applying the rearward cutting edges I'I of said blades to the surface under scraping treatment.

Owing to the disposition of the plurality of oblique cut blades I5 in diagonal extension across the longitudinal axis of the body or block I0, the highly desirable slicing or oblique cutting action of the operative cutting edges of the blades will tend to cause the tool to diverge from the desirably straight path of back and forth movement. Such divergence, unless substantially prevented, will counteract or neutralize the slicing or oblique cutting action of the tool which it is desirable to maintain. To prevent such divergence of the tool from the desired straight forward and back path of movement, the tool, according to the instant invention, is longitudinal tracking means preferably in the form of the tracker blades I4 respectively adjacent the opposite ends of the tool body or block I0. These tracker blades I4, being disposed across the tool body or block perpendicularly or right angularly to the longitudinal axis thereof, present their operative cutting edges squarely across the line of tool movement, so that no camming or laterally shifting force is transmitted by said tracker blades to the tool, but, on the contrary, the head on contact of these blades with the surface over which the tools is moved tends to oppose the tendency of the oblique cut blades to cause lateral shift of the tool during operation thereof. As a consequence of this, the tool is caused to firmly track in a straight path of movement without substantial divergence therefrom. A a result, the oblique cut blades I5 are so held to a straight path of movement, that the desired slicing cut effect thereof is not counteracted or neutralized. The slicing cut effect of the majority of the tool blades, as thus maintained, reduces the resistance to blade movement over and in operative contact with the surface under treatment, with the result that less physical exertion is required to be exercised by the operator, and consequently less fatigue is experienced by said operator.

The body or block I0 of the tool, being of resilient material and thus of some flexibility, will allow suiiicient iiexure of the tool-in use to cause the operative cutting edges of the blades to make effective contact with the surface undergoing scraping treatment, notwithstanding said surface may be somewhat uneven in plane. Also due to the elastic compressibility and flexibility of the tapered sections of the body or block ID intermediate the grooves or sockets, and especially between the grooves or sockets I2, the blades, in their operative positions, are resiliently backed so as to be somewhat yieldably supported, thus better assuring uniform engagement of the sharp cutting edges thereof with the surface undergoing scraping treatment.

Having now described my invention, I claim:

A scraping tool of the oscillating blade type comprising an elongated body having intermediate its ends a plurality of longitudinally spaced grooves of inverted V-shape in cross-section eX- tending across its bottom oblique to the longitudinal axis of the body, scraper blades respectively occupying respective oblique grooves with their upper longitudinal edges fulcrumed by the apices of said grooves for back and forth rocking movement therein, the lower longitudinal edges of said blades being sharpened to provide forwardly and rearwardly presented cutting edges, whereby said blades, due to their transversely oblique disposition, will cut with a slicing action when the body is reciprocated in a path parallel to its longitudinal axis, said body being further provided intermediate each end thereof and the adjacent end of the group of oblique scraper blades with a terminal groove of inverted crosssection extending across its bottom perpendicular to the longitudinal axis of the body, a tracker blade fulcrumed in the apex of each terminal groove for back and forth rocking movement therein, said tracker blades being operative to prevent substantial divergence of the tool in use from a path of longitudinal reciprocation parallel to the longitudinal axis of the tool body, whereby to assure desired slicing cut action of the oblique scraper blades, and means common to said oblique scraper blades and said tracker blades to retain the same within their grooves subject to back and forth rocking movement therein.

EUGENE P. HELLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number s Name Date 62,064 Peters et al Feb. 12, 1867 2,233,657 Wallace Mar. 4, 1941 2,269,811 Elwood Jan. 13, 1942 

